Abstract
In this work, the Ba0.2Sr0.8−yLayFe12O19 (y = 0.2, 0.4, 0.6 & 0.8) (BSLFO) nanorods were prepared using hydrothermal method. The hexagonal structure and nanorod formation were evidenced by X-ray diffraction patterns and micrographs, respectively. Further, the optical and magnetic properties of the BSLFO nanorods were investigated. Using the UV–Visible spectra of y = 0.2–0.8 contents, the optical bandgap (Eg) was determined. The Eg was increased from 3.502 to 3.714 eV as a function of La content. The Raman modes were detected using the Raman spectra for confirming the hexagonal structure of x = 0.2–0.8. The magnetic hysteresis curve indicated the decreasing trend of saturation magnetization (Ms) from 14.44 ± 0.507 to 4.15 ± 0.162 emu/g with ‘y’. This was determined using the law of approach to saturation (LAS) method. In addition, the magnetic permeability versus temperature (μ′-T) plots showed the decreasing nature of magnetic Curie transition temperature (Tc) from 753 to 703 K with increase of La content. Furthermore, the frequency dependence of magnetic permeability (μ′), magnetic loss (μ″) and relative magnetic loss (rlf: tanδ/μ′) was studied for all samples.